Very early NOTIFY support, hopefully fix -password on Windows

internal/imapserver/notify.go

@@ -0,0 +1,65 @@
+package imapserver
+
+import (
+	"fmt"
+	"log"
+
+	"github.com/emersion/go-imap"
+	"github.com/emersion/go-imap/server"
+)
+
+type IMAPNotifyHandler struct {
+	imap.Command
+}
+
+func (h *IMAPNotifyHandler) Handle(conn server.Conn) error {
+	// TODO: Support setting NOTIFY subscriptions or not
+	return nil
+}
+
+type IMAPNotify struct {
+	server *server.Server
+	log    *log.Logger
+}
+
+func (ext *IMAPNotify) Capabilities(c server.Conn) []string {
+	if c.Context().State&imap.AuthenticatedState != 0 {
+		return []string{"NOTIFY"}
+	}
+	return nil
+}
+
+func (ext *IMAPNotify) Command(name string) server.HandlerFactory {
+	if name != "NOTIFY" {
+		return nil
+	}
+	return func() server.Handler {
+		return &IMAPNotifyHandler{}
+	}
+}
+
+func (ext *IMAPNotify) NotifyNew(id, count int) error {
+	ext.server.ForEachConn(func(c server.Conn) {
+		var resptype imap.StatusRespType
+		if mailbox := c.Context().Mailbox; mailbox != nil && mailbox.Name() == "INBOX" {
+			resptype = imap.StatusRespType(
+				fmt.Sprintf("EXISTS %d", id),
+			)
+		} else {
+			resptype = imap.StatusRespType(
+				fmt.Sprintf("STATUS INBOX (UIDNEXT %d MESSAGES %d)", id+1, count),
+			)
+		}
+		_ = c.WriteResp(&imap.StatusResp{
+			Type: resptype,
+		})
+	})
+	return nil
+}
+
+func NewIMAPNotify(s *server.Server, log *log.Logger) *IMAPNotify {
+	return &IMAPNotify{
+		server: s,
+		log:    log,
+	}
+}